Benny and Rafi Fine, whose popular "Kids React" and "Teens React" videos have helped them accumulate more than 500 million views, started asking YouTube for help almost three years ago. They found that their videos, which often involve minors expressing strong opinions, generated torrents of hatred in the comments. "It has forced a huge part of our company to be dedicated to curbing hate-filled, bullying comments for far too long," the brothers wrote in an email to The Verge. They say they are cautiously optimistic that the changes will improve discussions.